Compare Resistive Touch Screen And Capacitive Touch Screen In Terms Of Technology, Cost, Power Comsumption,Touch Senseitivity,Display Quality and abundance Of Raw Materials.Can You Name Any Other Technology Used In Touch Screen Beside These Two.

Compare Resistive Touch Screen And Capacitive Touch Screen 


Capacitive touch screen
The capacitive touch screen is made up of a glass panel that is coated with a material.
The property of this material is that it can store electrical charge. So the capacitive touchscreens basically stores electrical charge.
But for good, Human body can also store charge. So, when you touch this screen with your finger, some of these charges on the screen gets transferred to your finger. The oscillator circuits located at the corner of your system will then sense this decrease in the charge on screen and the spot the exact location where touch occurred, and then transfers this specified information to the touchscreen driver software.
   

Pros:

• Multi touch support available
• Visibility good even in sunlight
• Highly sensitive to finger touch leading to ease of use
• Not prone to dust particles
• Glossy look and feel

Cons:

• Need to have atleast 5% humidity to achieve capacitive effect
• More expensive than Resistive touch screen
• Doesn't work with inanimate objects/fingernails/gloved fingers
• Latest technology, may need to evolve a bit more!

Resistive touch screen
Resistive touch screen, on the other hand is again made up of normal glass panel. However, this glass panel in this case is coated with three layers.Two of these layers being conductive and resistive are kept apart using spacers while the third scratch-resistant layer covers the whole setup. When the resistive touch screen system is running, current flows through these layers. On a finger touch, the two layers get connected and change in electrical field occurs. The system calculates the coordinates of point of contact and passes them to touch screen driver software.


Pros:

• Relatively cheaper
• Can operate with any pointing devices like stylus, pen, nail etc
• Can operate at any level of humidity
• Ease of use, as it could be used even with your winter gloves on!
• Very useful for people using handwriting recongition system, due to ease of use with a stylus!
• More accurate than capacitive touch screen!
• Old technology and hence more reliable!

Cons:

• Multi touch support not available. Though technology did evolve after some modifications with the existing resistive touch screen circuitry, its still not 100% developed yet!
• Highly sensitive. As it can operate with almost any sort of pointing devices, can be more vulnerable with dust particles!
• Poor visibility in sunlight, mostly due to multiple layers reflecting light!
• Screen, being sensitive at the upper layer, can be more vulnerable to scratches!

	Resistive Touchscreen	Capacitive Touchscreen
Visibility indoors	Typically very good	Typically very good
Visibility in sunlight	Typically poor, the extra layer reflects too much ambient light.	Typically very good.
Touch Sensitivity	Pressure is needed to make the contact within the screen's layers, can be affected with fingers (even with gloves on), fingernails, stylus, etc. The latter is important in Asian markets and anywhere where gesture or character recognition is important.	Even the slightest contact of your electron-rich finger with the screen's glass is enough to activate the capacitive sensing system below. Doesn't work with inanimate objects/fingernails/gloved fingers. Handwriting recognition is therefore cumbersome.
Accuracy	Accurate to at least display pixel resolution, as can be seen when drawing (or writing characters) with a stylus. Useful for handwriting recognition and interfaces with smaller control elements.	Accurate to within a few pixels, in theory, but seriously limited by the physical size of your fingertips, which make it hard to accurately press any control element or select something on screen that's smaller than 1cm2.
Cost	Cheap to use in a phone design.	Definitely more expensive than resistive screens, by between 10% and 50%, depending on who you talk to. On a flagship device, the extra build cost isn't that important, for a mid-priced phone, using a capacitive screen might be prohibitive.
Possibility for multi-touch	None, without re-engineering the way a resistive screen is wired into a device's electronics.	Depends on implementation and software, but used in the iPhone and tech-demoed on the HTC-made G1. Also may be legal battles with Apple, depending on how multi-touch is used?
Robustness	The very nature of resistive screens means that their top layer is soft, soft enough to press down and indent. This makes such a screen vulnerable to scratches and other minor damage. A resistive screen also gradually wears out and requires more frequent calibration.On the plus side, a resistive layer over a plastic screen does make for a device that's generally robust and unlikely to be damaged by a fall.	Glass can be used as the outer layer. Although not invulnerable (and certainly prone to shattering on major impact), glass is more resistant to casual scratches and blemishes.
Hygiene	Because a stylus or fingernail can be used to effect each touch, there's a potential for less fingerprints, finger grease and germs to be transferred to the screen.	Full finger touch is needed on the screen, but the use of glass as the main material means that the screen's also very quick and easy to clean.
Environmental concerns	Nokia has stated that the Nokia 5800, like all their phones, will work happily between -15°C and +55°C and at all real world humidities.	Typical operating temperature is 0° to 35°, requires at least 5% humidity (for capacitive effect to work)

Name Any Other Technology Used In Touch Screen Beside These Two.

Infrared

An infrared touchscreen uses an array of X-Y infrared LED and photodetector pairs around the edges of the screen to detect a disruption in the pattern of LED beams. These LED beams cross each other in vertical and horizontal patterns. This helps the sensors pick up the exact location of the touch. A major benefit of such a system is that it can detect essentially any input including a finger, gloved finger, stylus or pen. It is generally used in outdoor applications and point of sale systems which can't rely on a conductor (such as a bare finger) to activate the touchscreen. Unlike capacitive touchscreens, infrared touchscreens do not require any patterning on the glass which increases durability and optical clarity of the overall system.

Acoustic Pulse Recognition Touchscreens

lo Acoustic Pulse Recognition (APR) touchscreens use a completely new and unique way of sensing touches on a display. Consisting only of a glass overlay mounted in front of the display, together with a small electronic controller board, APR technology provides a new set of benefits that have only been partially achieved before by other touch technologies.

APR combines the ultimate in optical qualities, durability, and stability, with excellent dragging properties. By combining stylus, glove, bare finger and fingernail activation, with low-cost advantages, APR is well-suited for many diverse applications including kiosk, point-of-sale and medical instrumentation. In addition, its pure-glass surface is resistant to scratches, water and other contaminants on the screen, and can be scaled from 2.5-inch to 42-inch displays.

APR works in a simple and elegant way—by recognizing the sound created when the glass is touched at a given position.

Benefits

• Optics and durability of pure glass
• Works with finger, glove, pen, credit card, fingernail
• Resistant to water, dust, grease
• No wear-out mechanism
• Works even with scratches
• Excellent drag performance
• Sealable to NEMA 4/IP65 standards
• One time factory calibration, no drift
• Thin borders—only 5mm
• True flat surface
• Small and large sizes
• Palm rejection

Applications

• Restaurant and hospitality automation
• Retail
• Point-of-Sale (POS) terminals
• Pharmacy automation
• Industrial automation
• Office automation